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  1. WoodCutr

    Gmc topkick mystery tank under driver side step

    got side tracked from oil leaks today, got the throttle adjusted so its getting around 100% instead of the 50-60% it had before, and got the trans modulator cable fixed so no more transmission/torque converter roasting going on hopefully man this truck is a rocket unloaded and actually getting...
  2. WoodCutr

    Gmc topkick mystery tank under driver side step

    so, it has been determined that it gets warm ish with the engine, im thinking what Marc said, maybe to even out oil pressure, the truck stays at 50psi hot or cold
  3. WoodCutr

    Gmc topkick mystery tank under driver side step

    air brakes, yes, but not related to this "filter tube thingimajig" google doesnt show anything about it being an oil filter, supposed to hold 6.6 gallons, I got under 5 gallons out of the motor last week, and it wasnt that low on the dipstick, so I doubt a filter since it would hold extra
  4. WoodCutr

    Gmc topkick mystery tank under driver side step

    thats definitely a thought, seems like it would come apart, looking at other topkicks and I cant seem to find one with this tank thing, its usually just a box right there enclosing everything under the step I called the local cat dealer, and a big truck mechanic in town, google and sqwerl...
  5. WoodCutr

    Gmc topkick mystery tank under driver side step

    I've got a 92 topkick with the 3116 cat, found a mystery tank under drivers door step next to the fuel filter and air dryer, anyone know what it is? It seems both hoses go to the block and oilpan, one has a pressure sender/switch it looks like Has a big oil leak and I have to keep cardboard...
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